From: John Weekes <lists.xen@nuclearfallout.net>
To: xen-devel@lists.xensource.com
Subject: Re: Rather slow time of Pin in Windows with GPL PV driver
Date: Tue, 08 Mar 2011 23:58:28 -0800 [thread overview]
Message-ID: <4D773324.9000102@nuclearfallout.net> (raw)
In-Reply-To: <BLU157-w6170D9B9C6DC4E4CF04C2FDAC90@phx.gbl>
On 3/8/2011 10:53 PM, MaoXiaoyun wrote:
> Attached is the linux and Win2003 Ping result, which shows
> in Linux, the time is less than 1ms, and very stable, while in 2003,
> Ping time, minium to lese than 1ms, and maxium to 15ms, unstable.
>
> Those two HVMS is on the same host, we also test XP, 2008,
> and it looks like Ping on XP behavior normally, but in 2008, it has the
> same behavior as 2003.
This may not completely account for it, but try enabling the multimedia
timer on your Windows installs by starting up any application that asks
to use it at a 1ms resolution, such as Windows Media Player. Seeing RTTs
that are either 1ms or 15ms, but never a number in between, is a
tell-tale sign that the MM timer is not currently in use, and as a
result you're getting less accurate, more granular readings.
-John
next prev parent reply other threads:[~2011-03-09 7:58 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 6:53 Rather slow time of Pin in Windows with GPL PV driver MaoXiaoyun
2011-03-09 7:58 ` John Weekes [this message]
[not found] ` <D271C3A4-9B27-4E08-A92A-D55A811736EC@bendigoit.com.au>
2011-03-09 10:20 ` MaoXiaoyun
[not found] ` <BLU157-w82233DE21FFA3AC07FCC3DAC90@phx.gbl>
[not found] ` <AEC6C66638C05B468B556EA548C1A77D01C55DCB@trantor>
2011-03-09 11:15 ` MaoXiaoyun
2011-03-09 11:28 ` James Harper
2011-03-09 11:39 ` MaoXiaoyun
2011-03-10 3:17 ` MaoXiaoyun
2011-03-10 4:47 ` MaoXiaoyun
2011-03-10 6:27 ` James Harper
2011-03-10 9:27 ` Paul Durrant
2011-03-10 9:30 ` RE: Rather slow time of Pin in Windows with GPL PVdriver James Harper
2011-03-10 10:34 ` Paul Durrant
2011-03-10 10:41 ` James Harper
2011-03-10 11:05 ` Paul Durrant
2011-03-10 18:22 ` Pasi Kärkkäinen
2011-03-11 9:53 ` Paul Durrant
2011-03-13 23:43 ` RE: Rather slow time of Ping in Windows with GPLPVdriver James Harper
2011-03-14 10:22 ` Paul Durrant
2011-03-11 5:10 ` RE: Rather slow time of Pin in Windows with GPL PVdriver MaoXiaoyun
2011-03-12 23:15 ` James Harper
2011-03-14 0:45 ` James Harper
2011-03-14 2:44 ` MaoXiaoyun
2011-03-14 3:10 ` RE: Rather slow time of Ping " James Harper
2011-03-14 3:48 ` MaoXiaoyun
2011-03-14 3:50 ` James Harper
2011-03-14 10:35 ` Paul Durrant
2011-03-14 10:32 ` RE: Rather slow time of Pin " Paul Durrant
2011-03-14 11:20 ` James Harper
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